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Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..247h&link_type=abstract
The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 247-251 (1997).
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Characteristics And Properties Of External Galaxies And Extragalactic Objects, Ultraviolet, Mathematical Procedures And Computer Techniques
Scientific paper
We have begun analyzing archival WFPC2 F300W images to obtain galaxy counts over a wider area and at brighter magnitudes than those measured in the Hubble Deep Field (HDF), and to develop techniques for analyzing future random-field data. Galaxy counts at 300 nm are sensitive to evolutionary effects on relatively short timescales. Locally, in galaxies with a constant star formation rate, F300W detects stars averaging ~500 Myr in age, as compared to ~1.6 Gyr for B. At a redshift of 0.5, F300W detects stars averaging ~60 Myr in age. In order to determine the galaxy counts, we have developed a semi-automated analysis based on the SExtractor program of Bertin. An IDL program parses input parameters, removes cosmic rays, and invokes SExtractor, which generates the source catalogs. Another IDL program merges selected data from the catalogs after applying photometric zero points and correcting for Galactic extinction. A preliminary comparison of our F300W number counts to those from the HDF will be presented.
Collins Nicholas R.
Gardner Jonathan P.
Heap Sara R.
Hill Robert S.
Malumuth Eliot M.
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